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Preparation method of amorphous nanocrystalline coating based on electric-spark deposition

An amorphous nanocrystalline and electric spark deposition technology, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of low efficiency, increased equipment and processes, and improved enterprise efficiency, and achieves simplified process, Improved deposition efficiency and cost savings

Active Publication Date: 2015-04-15
HUNAN UNIV OF HUMANITIES SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, the shortcomings of slow deposition rate and low efficiency of EDM have not been effectively overcome. The main reason is that most of the electrode materials for EDM are currently made of tungsten-cobalt hard materials that are easy to purchase on the market. alloys and some such as TiB 2 Cermets such as TiC
The coating prepared by the above method has excellent comprehensive properties, but the heat treatment process described in it has the following disadvantages: (1) the mechanical properties of the original matrix material will be reduced; (2) for large workpieces, the heat treatment equipment needs more (3) The increase of equipment and processes is not conducive to the improvement of enterprise benefits

Method used

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  • Preparation method of amorphous nanocrystalline coating based on electric-spark deposition
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Experimental program
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Effect test

Embodiment 1

[0029] (1) FeB powder, Mo powder, Fe powder, Cr powder, Ni powder and graphite are used as raw materials to prepare Fe-6.0wt%B-48.0wt%Mo-2.5wt%Cr-3.1wt%Ni-0.5wt% The mixture of C; take 0.5% zinc stearate by weight of the above mixture and add it to the above mixture; put the mixture that has been added with the forming agent into a ball mill for ball milling, and when the ball milling is completed, the ball milled mixture Press into the required shape and size; put the pressed billet into the vacuum sintering furnace for vacuum sintering, the vacuum degree is higher than 1×10 -1 MPa, the sintering temperature is 1250°C, and the holding time is 30min.

[0030] (2) The electrode material prepared in the previous step was used for EDM deposition, and protected with argon gas. The flow rate of argon gas was 8L / min. The rate is 4min / cm 2 . After every 5 min of electrode material deposition, it was cooled to room temperature before re-deposition.

Embodiment 2

[0032] (1) FeB powder, Mo powder, Fe powder, Cr powder, Ni powder and graphite are used as raw materials to prepare Fe-6.0wt%B-48.0wt%Mo-2.5wt%Cr-3.1wt%Ni-0.5wt% The mixture of C; take 0.5% zinc stearate by weight of the above mixture and add it to the above mixture; put the mixture that has been added with the forming agent into a ball mill for ball milling, and when the ball milling is completed, the ball milled mixture Press into the required shape and size; put the pressed billet into the vacuum sintering furnace for vacuum sintering, the vacuum degree is higher than 1×10 -1 MPa, the sintering temperature is 1250°C, and the holding time is 30min.

[0033] (2) The electrode material prepared in the previous step is used for EDM deposition, and protected with argon gas, the flow rate of argon gas is 0.1L / min, and the specific process parameters of deposition are: output power is 3000W, output voltage is 240V, The deposition rate is 4min / cm 2 . After every 8 min of electro...

Embodiment 3

[0035] (1) FeB powder, Mo powder, Fe powder and graphite are used as raw materials to prepare a mixture of Fe-8.0wt%B-23.62wt%Mo-0.5wt%C; Zinc fatty acid is added to the above mixture; the mixture that has been added with the forming agent is put into a ball mill for ball milling, and after the ball milling is completed, the ball-milled mixture is pressed into the required shape and size; the pressed blank is put into Vacuum sintering is carried out in a vacuum sintering furnace, and the vacuum degree is higher than 1×10 -1 MPa, the sintering temperature is 1210°C, and the holding time is 50min.

[0036] (2) Use the electrode material prepared in the previous step for EDM deposition, and use a mixed gas of argon and helium with a volume fraction of 50% for protection. The flow rate of the mixed gas is 4L / min. The specific process parameters of the deposition For: the output power is 2500W, the output voltage is 180V, the deposition rate is 4min / cm 2 . After every 15 min of ...

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Abstract

The invention discloses a preparation method of an amorphous nanocrystalline coating based on electric-spark deposition. The amorphous nanocrystalline coating comprises the following elements of chemical components in percentages by weight: 4%-8.82% of B, 6%-72% of Mo, 0-15% of Cr, 0-15% of Ni, 0-15% of Mn, 0-15% of V and the balance of Fe. The preparation method comprises the following steps: firstly adopting a powder metallurgy technology to prepare and obtain an electrode material of Fe2B-Mo2FeB2-based metal ceramic or Mo2FeB2-based metal ceramic, then carrying out electric-spark deposition on the electrode material, and carrying out protection by using inert gas with the flow rate of 0.01-10 L / min, wherein the technological parameters of deposition are as follows: the output power is 2000-8000 W, the output voltage is 100-300 V, and the deposition rate is 0.5-10 min / cm2. According to the preparation method, the efficiency of the electric-spark deposition is obviously improved, and the relative content of amorphous nanocrystalline in the coating is conveniently and simply controlled.

Description

technical field [0001] The invention relates to a method for preparing a surface coating, in particular to a method for preparing an amorphous and nanocrystalline coating based on electric spark deposition, which can be used to strengthen, modify, repair and remanufacture the surface of metal parts, and can significantly Improve the wear resistance and corrosion resistance of the surface of parts. Background technique [0002] Surface engineering technology can prepare a coating or coating on the surface of a material that is different from the base material and has special properties such as light, electricity, magnetism, heat, wear resistance, and corrosion resistance. It changes the material in the most economical and effective way. The morphology, chemical composition and organizational structure of the surface and near-surface regions have realized the strengthening, modification, repair and remanufacturing of the material surface. This technology has been widely used ...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/06C22C45/02C23C26/02
CPCC22C45/02C22C45/10C23C4/06C23C4/12
Inventor 陈志国魏祥黄奇胜
Owner HUNAN UNIV OF HUMANITIES SCI & TECH
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